The fire-fighting pressure-maintaining pump system employs a vertical multi-stage fire-fighting pressure-stabilizing pump and intelligent automatic control technology to maintain the pressure of the fire-fighting pipeline network in real time, ensuring rapid response of automatic sprinkler and fire hydrant systems. The product features automatic pressure replenishment, constant pressure water supply, energy efficiency, stable operation, low noise, convenient maintenance, and multiple safety protections. It is widely used in high-rise buildings, commercial complexes, industrial plants, warehousing and logistics facilities, hospitals, airports, data centers, and municipal fire protection projects, providing a reliable, efficient, and intelligent pressure maintenance solution for modern fire-fighting water supply systems.